Nobody ever has because the true value of pi has never been worked out and we only use an approximation of pi when calculating the area of a circle.
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Archimedes discovered how to work out the area of the circle, and he also discovered pi.
tejeswar sivaji vechemgi discovered radius in circle
who discovrerd circle
The Egyptians calculated the area of a circle by a formula that gave a aproximate value of 3.1605
Area of a circle = pi*radius2